Just as thought excercise: - mechanical cannot be easily unlocked by conductors in case of emergency - mechanical would break more often because people don’t

Just as thought excercise: - mechanical cannot be easily unlocked by conductors in case of emergency - mechanical would break more often because people don’t care and would push on door even if it is occupied. - in a hurry might be more convenient to simply push button assuming one is already familiar with the system. - having only buttons it is easier to keep it clean and having people less contact with door handles/latches. - can be automatically locked on stations so people use them between stations so you don’t get foul smells while boarding and waiting